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Question

روا نیست این کار را انجام دهی

Answer 1

Hi

It's not fair to do that.s

Answer 2

Hi

Also, It's down and dirty to do something... / It is not a fair shake to do something .... / don't you dare to hit him/her/them below the belt / In case there's a transaction ==> It's a raw deal / to not to shoot straight e.g. The salesman always shoots straight when he is dealing with his customers. 

hope it serves well

all the best

Regards